IRWIN 1892008 Power Bit, T20, T25 Drive, Torx Drive, 1/4 in Shank, Hex Shank, Steel                           DoubleLok technology ensures both ends of bit lock securely in impact drivers and quick-change chucks, enabling use of two tips from one bit for added convenience and extended life. Precision tip geometry delivers superior fitment, reducing stripping and cam-out. Power groove designed for compatibility with IRWINA(R) Impact Performance Series magnetic screw hold attachment. Manufactured with heavy-duty, cold forged high-grade steel to withstand high torque output. T20/T25. 2-3/8 in overall length.